x = "my name is xh"
abc = 3


def getType(x):
    print(type(x))


def replace_x(x):
    print(x.replace("a", "b"))


getType(abc)
replace_x(x)


def f(x):
    pass


print(type(f(2)))

a = [1, 2, 3, None, (), [], ]
print(len(a))
# 空格不算
